1364.310.1 When Required. Carbon monoxide alarms are required to be installed in existing dwelling units having fuel-fired appliances or having attached garages. Where an application for approval is required for work involving any of the following areas or systems within that dwelling unit, carbon monoxide alarms are required to be installed.
a. The addition or creation of a new sleeping room;
b. An alteration of a sleeping room;
c. An alteration in the immediate vicinity outside of a sleeping room;
d. An addition of, or an alteration to, an attached garage;
e. An addition, alteration, repair or replacement of a fuel-fired appliance;
f. As otherwise required by applicable provisions of the OBC or RCO.